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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5932404d2e2c97281e31e68448e688a20b55fd1942f1284d68dab4cbaa6bf56' 
  AND token = 'kBHmm5lDTPVt9AugfaMqZq/p3wqdytXptJ9tWrqOC6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}